factor.py 文件源码

def EMA(security_list, timeperiod=30):
    # ????????????
    if isinstance(security_list, str):
        security_list = [security_list]
    # ?? EMA
    security_data = history(timeperiod * 2, '1d', 'close',
                            security_list, df=False, skip_paused=True)
    ema = {}
    for stock in security_list:
        ema[stock] = talib.EMA(security_data[stock], timeperiod)
    return ema

# DMA